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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19065c47f08698c8e6bf1b9e417a69cec61baafc922d0ec1d4b1b9ae4e964b71' 
  AND token = 'seFfQoaWA7KyNfEFC/8140Ik7ftRZ+B+MBw3Q2hKgCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}